21587821330 has 8 divisors (see below), whose sum is σ = 38858078412. Its totient is φ = 8635128528.

The previous prime is 21587821327. The next prime is 21587821391. The reversal of 21587821330 is 3312878512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21468989529 + 118831801 = 146523^2 + 10901^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079391057 + ... + 1079391076.

Almost surely, 2^21587821330 is an apocalyptic number.

21587821330 is a deficient number, since it is larger than the sum of its proper divisors (17270257082).

21587821330 is a wasteful number, since it uses less digits than its factorization.

21587821330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158782140.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 21587821330 in words is "twenty-one billion, five hundred eighty-seven million, eight hundred twenty-one thousand, three hundred thirty".